Drying device for drying lump ore through low-temperature flue gas

Abstract

The utility model discloses a drying device for drying lump ore through low-temperature flue gas, relates to the technical field of equipment before iron making, and aims to solve the problems that the moisture content of the lump ore is high and the waste heat utilization scheme of the low-temperature flue gas is single at the same time. A lump ore chamber is of a cavity structure with the upper cross sectional area larger than the lower cross sectional area, a smoke chamber is an annular cavity and is fixed to the periphery of the lump ore chamber in a surrounding mode, the annular inner periphery is in surface contact with the periphery of the lump ore chamber, and a heat-resisting lining plate is fixedly arranged on the inner wall of the lump ore chamber and used for preventing adhesion and resisting abrasion. The upper end of the lump ore chamber is provided with an ore inlet and a dust steam outlet, and the lower end is provided with an ore outlet; the upper part of the smoke chamber is connected with a plurality of air outlet elbows, the lower part of the smoke chamber is connected with a plurality of air inlet elbows, and a plurality of guide plates are fixedly arranged in the air outlet elbows, the air inlet elbows and the smoke chamber respectively; a heat preservation shell is arranged on the periphery of the flue gas chamber; the lump ore drying device can directly utilize waste heat of low-temperature flue gas to dry lump ore, reduces water content of the lump ore entering the furnace, and is beneficial to controlling smelting cost, reducing smelting energy consumption and maintaining production stability of the blast furnace.

Description

Technical Field

[0001] The utility model relates to the technical field of ironmaking equipment, in particular to a drying device for drying lump ore with low-temperature flue gas. Background Art

[0002] Sintering is an important process in the pre-iron system, and is mainly heated by solid fuels such as anthracite or coke powder. The flue gas after denitrification and the flue gas at the end of the cooler still have a certain amount of heat, about 120℃ and 150℃ respectively, and are usually called low-temperature flue gas. Since this part of the flue gas is large in volume, it has considerable utilization value.

[0003] At present, the utilization of low-temperature flue gas is mainly done in a small amount for hot air sintering (for insulation after sintering ignition) or for hot air ignition of sintering after flue gas dust removal. For those with strict energy-saving and environmental protection requirements, it will be used for flue gas circulation sintering; low-temperature flue gas can also be used for waste heat power generation, or exchanged with water or water vapor for heating and water supply within the factory. These types of low-temperature flue gas waste heat utilization all require water as the heat transfer medium for heat exchange, and then in the form of hot water or water vapor to complete the heat recovery and utilization. Although the utilization efficiency of these schemes is general, because they are similar to the different forms of flue gas waste heat utilization in various industries, they provide a relatively mature and general technical means for the utilization of low-temperature flue gas waste heat, but at the same time also limit the further widespread development of low-temperature flue gas waste heat utilization.

[0004] The raw materials for pig iron required by the steel industry are mainly provided by blast furnace smelting; natural lump ore is one of the furnace charges, and its addition amount can reach up to 30%. Natural lump ore has a certain moisture content, and its traditional feeding method mostly uses wet ore directly into the furnace; after the lump ore enters the furnace, the vaporization of water requires energy consumption, which increases the coke ratio, leads to an increase in blast furnace smelting costs, and affects the stability of the furnace condition. In addition, natural lump ore is mostly imported; usually shipped by sea to the raw material terminal, unloaded, piled in the open air, and then transported in batches to the lump ore shed of the steel enterprise, which causes the moisture content of the lump ore to increase further, especially in rainy seasons, the above problems are even worse.

[0005] If the above two problems can be solved at the same time by upgrading the green, low-carbon and energy-saving technologies and equipment of the pre-iron system, it can bring great benefits to the cost control and green development of steel enterprises. Therefore, a low-temperature flue gas drying lump ore drying device is urgently needed to solve this problem. Utility Model Content

[0006] The utility model aims to provide a drying device for drying lump ore with low-temperature flue gas, so as to solve the problems of high moisture content of lump ore and single waste heat utilization scheme of low-temperature flue gas.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a drying device for low-temperature flue gas drying lump ore, comprising a lump ore chamber and a flue gas chamber, the lump ore chamber being a chamber structure with an upper cross-sectional area larger than a lower cross-sectional area, the flue gas chamber being an annular chamber fixed around the periphery of the lump ore chamber, and the inner periphery of the annular chamber is in surface contact with the periphery of the lump ore chamber, the inner wall of the lump ore chamber is fixed with a heat-resistant lining for anti-sticking and wear resistance; an ore inlet and a dust and steam outlet are provided at the upper end of the lump ore chamber, and an ore outlet is provided at the lower end; a plurality of air outlet elbows are connected to the upper part of the smoke chamber, and a plurality of air inlet elbows are connected to the lower part, and a plurality of guide plates are fixed to the air outlet elbows, the air inlet elbows and the smoke chamber respectively; an insulating shell is provided on the outer periphery of the smoke chamber, which wraps the entire outer walls of the smoke chamber, the air inlet elbows and the air outlet elbows.

[0008] Preferably, the block ore chamber is in the shape of an inverted four-sided pyramid, and the smoke chamber is provided with an air inlet elbow and an air outlet elbow on each side of the block ore chamber, and an air inlet elbow is provided at the lower end of each side, and two air outlet elbows are provided at the upper end of each side for balancing the airflow.

[0009] Preferably, the lower end and the upper end of the smoke chamber are respectively provided with a plurality of lower interfaces and upper interfaces for connecting the air inlet elbow and the air outlet elbow; the guide plates in the smoke chamber include zigzag guide plates, vertical guide plates and parallel guide plates, wherein the zigzag guide plates and the vertical guide plates are arranged in the lower part of the smoke chamber, the vertical guide plates are vertically fixed in the middle, and a plurality of zigzag guide plates are symmetrically arranged on both sides thereof, the zigzag guide plate includes a lower vertical part and an upper bent part, the lower vertical part is parallel to the vertical guide plate and the two side surfaces are parallel to the forward direction of the airflow, the distance from the end of the upper bent part of the zigzag guide plate away from the lower vertical part to the vertical guide plate is greater than the distance from the lower vertical part to the vertical guide plate; the parallel guide plates are located in the middle part of the smoke chamber and are provided in plurality, which are arranged perpendicular to the forward direction of the airflow, and the parallel guide plates are in the shape of a hollow grid, which is used to comb the airflow to make the smoke evenly distributed.

[0010] Preferably, an air inlet 1 and an air outlet 1 are respectively provided at both ends of the air inlet elbow, a plurality of arc-shaped guide plates 1 are fixedly provided at the bending part inside the air inlet elbow, an air inlet 2 and an air outlet 2 are respectively provided at both ends of the air outlet elbow, a plurality of arc-shaped guide plates 2 are fixedly provided at the bending part inside the air outlet elbow, and the arc-shaped guide plates 1 and 2 are used to make the smoke evenly distributed and reduce the resistance.

[0011] Preferably, the inner walls of the air inlet elbow and the air outlet elbow are respectively provided with a layer of wear-resistant lining one and a wear-resistant lining two, both of which are made of ceramic linings or wear-resistant coatings; the outer walls of the air inlet elbow and the air outlet elbow at the bending part are respectively provided with a layer of thickened external backpack one and an external backpack two, both of which are made of alloy backpacks or grouting material backpacks.

[0012] Preferably, the thermal insulation shell is composed of a thermal insulation liner and a thermal insulation panel, and the thermal insulation panel is laid on the outside of the thermal insulation liner.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The low-temperature flue gas drying lump ore drying device has a simple and reasonable structure, is easy to operate and practical, can directly utilize the waste heat of low-temperature flue gas without heat exchange through water or other media, and can also dry the lump ore to reduce its moisture content entering the furnace, which is beneficial to reducing the coke ratio, controlling the smelting cost, reducing the smelting energy consumption, and maintaining the stability of the furnace condition and the stability of blast furnace production.

[0015] 2. The low-temperature flue gas drying device for lump ore adopts the convection mode of flue gas from bottom to top and lump ore from top to bottom, which can carry out continuous, lasting and progressive heat exchange to achieve good drying effect. The dust and steam in the lump ore can be connected to the nearest dust removal equipment for treatment through the dust and steam outlet, and discharged after meeting the standards, which is easy to meet environmental protection requirements.

[0016] 3. The low-temperature flue gas drying device for lump ore is provided with arc-shaped guide plates in the inlet and outlet elbows, which can improve the uniformity of the imported flue gas distribution, reduce the system resistance, and make the airflow smoother. The inner wall is provided with a wear-resistant lining to prevent direct erosion of the flue gas, reduce friction and wear, and protect the service life of the elbow body. A backpack is provided on the outer wall of the bending part to further improve the wear resistance and impact resistance and increase the service life of the system; multiple groups of guide plates of different types are arranged in the flue gas chamber to improve the uniformity of flue gas distribution, enhance heat exchange, and reduce system resistance; the heat-resistant lining plate arranged on the inner wall of the lump ore chamber has anti-sticking, wear-resistant and heat-resistant functions, which can ensure the smooth descent of the ore in the body and protect the service life of the chamber; an insulation shell is arranged on the outside to reduce heat loss and improve heat utilization efficiency.

[0017] 4. The low-temperature flue gas drying lump ore drying device has no special requirements for equipment and materials, and the scheme configuration and implementation are simple and the process is reliable. Therefore, it can be directly used in newly designed sintering, desulfurization and denitrification, blast furnace and corresponding old plant system renovation projects, especially in blast furnace smelting projects using high-moisture content lump ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 A schematic diagram of a top view of an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the position relationship of each guide plate in the smoke chamber of the utility model;

[0021] Figure 4 It is a schematic cross-sectional structure diagram of the thermal insulation shell of the present utility model.

[0022] In the figure: 1—air inlet elbow, 101—air inlet one, 102—air outlet one, 103—arc guide plate one, 104—wear-resistant lining one, 105—external backpack one;

[0023] 2—smoke chamber, 201—lower interface, 202—upper interface, 203—folded line guide plate, 204—vertical guide plate, 205—parallel guide plate;

[0024] 3—air outlet elbow, 301—air inlet 2, 302—air outlet 2, 303—arc guide plate 2, 304—wear-resistant lining 2, 305—external backpack 2;

[0025] 4—block chamber, 401—mine entrance, 402—mine exit, 403—heat-resistant lining, 404—dust and steam outlet;

[0026] 5—insulation shell, 501—insulation liner, 502—insulation panel. DETAILED DESCRIPTION

[0027] See also Figures 1 to 4 A low-temperature flue gas drying device for lump ore comprises a lump ore chamber 4 and a flue gas chamber 2. The lump ore chamber 4 is a chamber structure with an upper cross-sectional area larger than a lower cross-sectional area. The flue gas chamber 2 is an annular chamber fixed around the outer periphery of the lump ore chamber 4, and the inner periphery of the annular chamber is in surface contact with the outer periphery of the lump ore chamber 4. A heat-resistant lining plate 403 is fixedly arranged on the inner wall of the lump ore chamber 4 for anti-sticking and wear resistance; an ore inlet 401 and a dust and steam outlet 404 are provided at the upper end of the lump ore chamber 4, and an ore outlet 402 is provided at the lower end; a plurality of air outlet elbows 3 are connected to the upper part of the flue gas chamber 2, and a plurality of air inlet elbows 1 are connected to the lower part, and a plurality of guide plates are fixedly arranged in the air outlet elbows 3, the air inlet elbows 1 and the flue gas chamber 2 respectively; an insulating shell 5 is provided on the outer periphery of the flue gas chamber 2, which wraps the entire outer walls of the flue gas chamber 2, the air inlet elbow 1 and the air outlet elbow 3.

[0028] In a preferred embodiment, Figure 1 and Figure 2 As shown, the block ore chamber 4 is an inverted four-sided pyramid, and the smoke chamber 2 is provided with an air inlet elbow 1 and an air outlet elbow 3 on each side of the block ore chamber 4, and the air inlet elbow 1 is provided at the lower end of each side, and the air outlet elbow 3 is provided at the upper end of each side for balancing the airflow.

[0029] The smoke chamber 2 may include the following specific structures: a plurality of lower interfaces 201 and upper interfaces 202 are respectively provided at the lower end and the upper end thereof for connecting the air inlet elbow 1 and the air outlet elbow 3; the guide plates in the smoke chamber 2 include a zigzag guide plate 203, a vertical guide plate 204 and a parallel guide plate 205, wherein the zigzag guide plate 203 and the vertical guide plate 204 are arranged at the lower part of the smoke chamber 2, the vertical guide plate 204 is vertically fixed in the middle, and a plurality of zigzag guide plates 203 are symmetrically arranged on both sides thereof, the zigzag guide plate 203 includes a lower vertical portion and an upper bent portion, the lower vertical portion is parallel to the vertical guide plate 204 and the two sides are The surface is parallel to the forward direction of the airflow, and the distance from the end of the upper bending part of the zigzag guide plate 203 away from the lower vertical part to the vertical guide plate 204 is greater than the distance from the lower vertical part to the vertical guide plate 204; the parallel guide plates 205 are located in the middle of the smoke chamber 2 and are provided in plurality, which are arranged perpendicular to the forward direction of the airflow, and the parallel guide plates 205 are hollow grid-shaped. These guide plates can be used to comb the airflow to make the smoke evenly distributed, which is beneficial to improve the smoke distribution, enhance heat exchange, and reduce system resistance; in addition, the smoke chamber 2 can adopt the same four-sided prism shape as the above-mentioned block ore chamber 4, and the hollow is used to surround the block ore chamber 4.

[0030] An air inlet 101 and an air outlet 102 are respectively provided at both ends of the air inlet elbow 1, and a plurality of arc-shaped guide plates 103 are fixedly arranged at the bending part inside the air inlet elbow 1, and an air inlet 2 301 and an air outlet 2 302 are respectively provided at both ends of the air outlet elbow 3, and a plurality of arc-shaped guide plates 2 303 are fixedly arranged at the bending part inside the air outlet elbow 3, and the arc-shaped guide plates 103 and 303 are used to make the smoke evenly distributed and reduce the resistance; for reference, the air inlet 101 is connected to the external hot air flue, and the air outlet 2 302 is connected to the external return air flue, and the connection method with the flue can be connected by a flange and its sealing fasteners, which is convenient for disassembly and inspection and maintenance, and the air outlet 102 and the air inlet 2 301 are respectively connected to the above-mentioned lower interface 201 and upper interface 202, preferably by sealed welding, so as to reduce the air leakage points inside the device, increase the sealing effect, and improve the heat utilization efficiency.

[0031] The inner walls of the air inlet elbow 1 and the air outlet elbow 3 are respectively provided with a wear-resistant lining 104 and a wear-resistant lining 2 304, both of which are made of ceramic linings or wear-resistant coatings; the outer walls of the air inlet elbow 1 and the air outlet elbow 3 at the bending parts are respectively provided with a thickened external backpack 105 and an external backpack 2 305, both of which are made of alloy backpacks or grouting material backpacks.

[0032] The insulation shell 5 is composed of an insulation liner 501 and an insulation panel 502, and the insulation panel 502 is laid on the outside of the insulation liner 501; for reference, the total thickness of the insulation shell 5 can be δ=80~100mm, and the insulation liner 501 can adopt lightweight materials such as rock wool to reduce heat loss, maintain good thermal effect, and save costs; the insulation panel 502 is generally provided with multiple pieces interconnected to form a whole, protect the liner, ensure the insulation effect, and beautify the appearance. It can be made of galvanized iron sheet or color steel plate, which is economical and practical.

[0033] For specific reference, in the above-mentioned drying device, the air inlet elbow 1 and the air outlet elbow 3 can be a "circular tube + prism" type special-shaped steel structure with an angle of 90° in the direction of the inlet and outlet airflow. 2 to 3 arc-shaped guide plates are arranged at the sharp turn to improve the uniformity of the inlet flue gas distribution and reduce the system resistance. The inner wall is provided with a wear-resistant lining to prevent direct erosion of the flue gas, reduce friction and wear, and protect the service life; the wear-resistant lining can be made of δ = 4 to 5mm ceramic sheet or δ = 30 to 50mm composite spray coating (based on an inner diameter ≥ 1000mm); the outer arc wall is provided with a δ = 40 to 80mm alloy backpack or grouting material backpack to further improve the wear resistance and impact resistance and increase the service life of the system;

[0034] The block chamber 4 is a prism hollow steel structure with a large effective volume, and is tightly wrapped by the flue gas field in the surrounding flue gas chamber 2 to increase the heat exchange area and enhance the heat exchange performance; after the block enters from the upper ore inlet, it moves downward in the body and moves relative to the hot air flowing upward in the flue gas field. The flue gas flow rate in the flue gas chamber 2 can generally be controlled at 18-25m / s; continuous heat exchange can be carried out for several hours to achieve a good drying effect; the effective volume of the chamber can be determined comprehensively according to production requirements, the moisture content of the block and the situation of the flue gas field. The heat-resistant lining 403 in the block chamber has anti-sticking, wear-resistant and heat-resistant functions, which can ensure the smooth descent of the ore in the body and protect the service life of the chamber. Part of the water in the block volatilizes into water vapor under the action of hot flue gas, and is discharged through the dust and gas outlet at the top of the block chamber, enters the dust removal system for treatment, and is discharged after meeting the standards, which can meet environmental protection requirements; the dried block is discharged through the lower ore outlet of the block chamber and enters the external ore discharge facility.

[0035] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

[0036] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A low-temperature flue gas drying device for lump ore, characterized in that: The invention comprises a lump ore chamber (4) and a smoke chamber (2); the lump ore chamber (4) is a chamber structure with an upper cross-sectional area larger than a lower cross-sectional area; the smoke chamber (2) is an annular chamber fixed around the outer periphery of the lump ore chamber (4); the inner periphery of the annular chamber is in surface contact with the outer periphery of the lump ore chamber (4); a heat-resistant lining plate (403) is fixedly provided on the inner wall of the lump ore chamber (4) for preventing adhesion and resisting wear; an ore inlet (401) and a dust and steam outlet (402) are provided at the upper end of the lump ore chamber (4); 04), with a mine outlet (402) at the lower end; the upper part of the smoke chamber (2) is connected to a plurality of outlet elbows (3), and the lower part is connected to a plurality of inlet elbows (1); a plurality of guide plates are fixedly arranged in the outlet elbows (3), the inlet elbows (1) and the smoke chamber (2); the outer periphery of the smoke chamber (2) is provided with an insulation shell (5), which wraps the entire outer wall of the smoke chamber (2), the inlet elbows (1) and the outlet elbows (3).

2. The low-temperature flue gas drying device for lump ore according to claim 1, characterized in that: The lump ore chamber (4) is in the shape of an inverted four-sided pyramid. The smoke chamber (2) is provided with an air inlet elbow (1) and an air outlet elbow (3) at each side of the lump ore chamber (4). There is one air inlet elbow (1) at the lower end of each side, and two air outlet elbows (3) are provided at the upper end of each side, for balancing the airflow.

3. The low-temperature flue gas drying device for lump ore according to claim 1, characterized in that: The lower end and the upper end of the smoke chamber (2) are respectively provided with a plurality of lower interfaces (201) and upper interfaces (202) for connecting the air inlet elbow (1) and the air outlet elbow (3); the guide plates in the smoke chamber (2) include a zigzag guide plate (203), a vertical guide plate (204) and a parallel guide plate (205), wherein the zigzag guide plate (203) and the vertical guide plate (204) are arranged at the lower part of the smoke chamber (2), the vertical guide plate (204) is vertically fixed in the middle, a plurality of zigzag guide plates (203) are symmetrically arranged on both sides thereof, and the zigzag guide plates (205) are arranged at the lower part of the smoke chamber (2), and the vertical guide plate (204) is vertically fixed in the middle, and a plurality of zigzag guide plates (203) are symmetrically arranged on both sides thereof. The flow plate (203) comprises a lower vertical portion and an upper bent portion, the lower vertical portion is parallel to the vertical guide plate (204) and the two side surfaces are parallel to the forward direction of the airflow, the distance from one end of the upper bent portion of the zigzag guide plate (203) away from the lower vertical portion to the vertical guide plate (204) is greater than the distance from the lower vertical portion to the vertical guide plate (204); a plurality of parallel guide plates (205) are located in the middle of the smoke chamber (2) and are arranged perpendicular to the forward direction of the airflow, the parallel guide plates (205) are in the shape of a hollow grid and are used to comb the airflow so that the smoke is evenly distributed.

4. The low-temperature flue gas drying device for lump ore according to claim 1, characterized in that: The two ends of the air inlet elbow (1) are respectively provided with an air inlet port 1 (101) and an air outlet port 1 (102); a plurality of arc-shaped guide plates 1 (103) are fixedly arranged at the bend inside the air inlet elbow (1); the two ends of the air outlet elbow (3) are respectively provided with an air inlet port 2 (301) and an air outlet port 2 (302); a plurality of arc-shaped guide plates 2 (303) are fixedly arranged at the bend inside the air outlet elbow (3); the arc-shaped guide plates 1 (103) and the arc-shaped guide plates 2 (303) are used to evenly distribute smoke and reduce resistance.

5. The low-temperature flue gas drying device for lump ore according to claim 4, characterized in that: The inner walls of the air inlet elbow (1) and the air outlet elbow (3) are respectively provided with a layer of wear-resistant inner lining one (104) and a layer of wear-resistant inner lining two (304), both of which are made of ceramic linings or wear-resistant coatings; the outer walls of the air inlet elbow (1) and the air outlet elbow (3) at the bending parts are respectively provided with a layer of thickened external backpack one (105) and an external backpack two (305), both of which are made of alloy backpacks or grouting material backpacks.

6. The low-temperature flue gas drying device for lump ore according to claim 1, characterized in that: The thermal insulation shell (5) is composed of a thermal insulation inner liner (501) and a thermal insulation panel (502), and the thermal insulation panel (502) is laid on the outer side of the thermal insulation inner liner (501).

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